2 bathroom extractor vents 1 fan, 1 vent tile.

[brendangrant]

Hi,

I want to wire an inline extractor fan to extract 2 bathrooms, extractor comes on with light switch. Can anyone provide the wiring diagram to prevent back feed for the light into the other bathroom, I think a relay is required?

thank you

 

[winston1]

No relay required. You need a double pole switch at each location. One pole switching it’s local light and the other pole the common fan.

MK3151 is usually used for this application.

 

[Taylortwocities]

As well as r we electrical “back feed” you need to prevent air back feed. Air, like water, will rake the easiest route. Do you may get smelly smells from room 1 being pushed into room 2.

You’ll need backdraft flaps in each room’s duct to prevent this.

 

[sparkwright]

Why can't you have two separate fans and 2 separate ducts?

 

[brendangrant]

Thanks for the replies....2 double pole switches it is.

Why can't you have two separate fans and 2 separate ducts?

I only have one roof tile vent available the other is used as watse vent so rather than install another roof tile vent it is easer to install 2 double pole switches as suggested. I heard of this configuration before